New big-name "advisers" will augment the show's coaches, lend their expertise to show's aspiring singers
Leona Lewis, Natasha Bedingfield, Donna Summer, Jermaine Dupri are among those joining Jewel and Kara DioGuardi to help unearth the next generation of songwriting stars starting May 30
Series will feature former "American Idol" regular Kara DioGuardi returning to the judging table
TV Academy also books Jewel to perform, Jeff Probst and "True Blood" stars to present
